Tool-handle



R. c. HILL.

TOOL HANDLE.

APPLICATION F|L ED MAY H, I920.

Patented Nov. 30, 1920.

INVENTOR' RWXMA ATTORNEV.

UNITED STATES PATENT OFFICE.

ROWLAND C. HILL, OF FITCHBURG, MASSACHUSETTS, ASSIGNOR TO SIMONDS MANU- FACTURING COMPANY, OF FITCHBURG, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

TOOL-HANDLE.

Application filed May 11,

To aZZ whom it may concern:

Be it known that I, ROWLAND G. HILL, a citizen of the United States of America, residing at F itchburg, in the county of Worcester and Commonwealth of Massachusetts, have invented an Improvement in T001 Handles, of which the following is a Speci-' fication.

This invention relates to tool-handles, and consists in means for holding tools, having a screw-threaded shank or tang, securely therein, when once properly inserted; this object is attained by employing a spiral coil of wire inserted in the hand-grip portion, which wire has the number of coils per inch either greater or less, but preferably greater, than the number of threads per inch on the tool shank which is to be used therewith.

By this means when the handle and tool are screwed together the angle of the helix of the coil will be increased or decreased, depending upon whether the number of threads per inch of the screw, is lesser or greater than the number of coils per inch of the helix; in the former case contracting the coil and in the latter expanding it; but in either case the friction between the contacting parts will be increased and thus tend to lock them together and prevent them from becoming loose, especiall when the wire coil and screw-thread o the shank have become worn.

The drawing forming a part of this specification, shows a longitudinal diametrical section of the hand-grip, socket, coiled wire and ferrule and a side elevation of a part of the screw-threaded shank of a tool.

Referring to the drawing by reference characters; A is the hand-grip, B the socket therein, C, the coiled wire within the socket, D, the ferrule on the end of the hand-grip and E, is the screw-threaded end of a portion of the shank of a .tool.

A coiled wire of ductile metal to insure good electrical connection in a lightning rod, has heretofore been screwed into a threaded socket, but it was not relied upon to prevent the pulling apart of the coupling, as the ribbed end of one of the sections was bent over so as to engage the interiorof the Specification 0! Letters Patent.

Patented Nov. 30, 1920.

1920. Serial No. 380,585.

other section and thus produce suflicient friction to hold the sections together.

In the construction of the present improvement, the spiral coil serves as a screwthread in the socket, but also as locking means for holding the tool-shank in the hand-gri when they are screwed together.

Ifthe friction of the coil within the socket 4 1. A tool-handle, comprising a hand-grip member with a tool socket therein, a coiled wire in the socket, the diameter of which coil is normally greater than the diameter of the socket hole, and a tool for the socket, having a screw-threaded shank the threads of which are less in pitch than the angle of the helix of the wire coil, for the purpose specified.

2. A tool-handle, comprising a hand-grip member, atool-socket therein, a tool having a screw-threaded shank, a wire coil in the socket, the pitch of the coils of which is greater than the pitch of the threads of the screw on the shank of the tool to be inserted therein.

3. A tool-handle, comprising a hand-grip member with a tool-socket therein, a coiled wire in the socket, the diameter of which coil is normally greater than that of the socket hole and a tool for the socket having a screw-threaded shank the threads of which are different in pitch from the angle of the helix of the said wire coil.

4:. A tool-handle, comprising a hand-grip member having a socket in the end thereof, a coiled wire in the said socket one end of which coil is fastened to the socket, and a tool-shank provided 7 with screw-threads which have a pitch less than that of the angle of the helix of the said wire coil. 

